By a News Reporter-Staff News Editor at Journal of Engineering -- Researchers detail new data in Engineering - Rock Engineering. According to news reporting originating from Xuzhou, People’s Republic of China, by VerticalNews correspondents, research stated, “To explore the acoustic emission (AE) characteristics of rock materials during the deformation and failure process under periodic loads, a uniaxial cyclic loading and unloading compression experiment was conducted based on an MTS 815 rock mechanics test system and an AE21C acoustic emissions test system. The relationships among stress, strain, AE activity, accumulated AE activity and duration for 180 rock specimens under 36 loading and unloading rates were established.”
Financial supporters for this research include National Natural Science Foundation of China, National Key Research and Development Program of China, China Postdoctoral Science Foundation, 973 National Basic Research Program.
Our news editors obtained a quote from the research from the China University of Mining and Technology, “The cyclic AE evolutionary laws with rock stress-strain variation at loading and unloading stages were analyzed. The Kaiser and Felicity effects of rock AE activity were disclosed, and the impact of the significant increase in the scale of AE events on the Felicity effect was discussed. It was observed that the AE characteristics are closely related to the stress-strain properties of rock materials and that they are affected by the developmental state and degree of internal microcracks. AE events occur in either the loading or unloading stages if the strain is greater than zero. Evolutionary laws of AE activity agree with changes in rock strain. Strain deformation is accompanied by AE activity, and the density and intensity of AE events directly reflect the damage degree of the rock mass. The Kaiser effect exists in the linear elastic stage of rock material, and the Felicity effect is effective in the plastic yield and post-peak failure stages, which are divided by the elastic yield strength. This study suggests that the stress level needed to determine a significant increase in AE activity was 70% of the i + 1 peak stress. The Felicity ratio of rock specimens decreases with the growth of loading-unloading cycles.”
According to the news editors, the research concluded: “The cycle magnitude and variation of the Felicity effect, in which loading and unloading rates play a weak role, are almost consistent.”
For more information on this research see: Acoustic Emission Characteristics of Red Sandstone Specimens Under Uniaxial Cyclic Loading and Unloading Compression. Rock Mechanics and Rock Engineering , 2018;51(4):969-988. Rock Mechanics and Rock Engineering can be contacted at: Springer Wien, Sachsenplatz 4-6, PO Box 89, A-1201 Wien, Austria. (Springer - www.springer.com; Rock Mechanics and Rock Engineering - http://www.springerlink.com/content/0723-2632/)
The news editors report that additional information may be obtained by contacting M.W. Zhang, China Univ Min & Technol, Sch Mech & Civil Engn, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, People’s Republic of China. Additional authors for this research include Q.B. Meng, L.J. Han, H. Pu and Y.L. Chen.
The direct object identifier (DOI) for that additional information is: https://doi.org/10.1007/s00603-017-1389-6. This DOI is a link to an online electronic document that is either free or for purchase, and can be your direct source for a journal article and its citation.
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2018, NewsRx LLC
CITATION: (2018-04-16), Researchers from China University of Mining and Technology Describe Findings in Rock Engineering (Acoustic Emission Characteristics of Red Sandstone Specimens Under Uniaxial Cyclic Loading and Unloading Compression), Journal of Engineering, 1161, ISSN: 1945-872X, BUTTER® ID: 015493453
From the newsletter Journal of Engineering.
https://www.newsrx.com/Butter/#!Search:a=15493453
This is a NewsRx® article created by NewsRx® and posted by NewsRx®. As proof that we are NewsRx® posting NewsRx® content, we have added a link to this steemit page on our main corporate website. The link is at the bottom left under "site links" at https://www.newsrx.com/NewsRxCorp/.
We have been in business for more than 20 years and our full contact information is available on our main corporate website.
We only upvote our posts after at least one other user has upvoted the article to increase the curation awards of upvoters.
NewsRx® offers 195 weekly newsletters providing comprehensive information on all professional topics, ranging from health, pharma and life science to business, tech, energy, law, and finance. Our newsletters report only the most relevant and authoritative information from qualified sources.
Hi! I am a robot. I just upvoted you! I found similar content that readers might be interested in:
https://link.springer.com/article/10.1007/s00603-017-1389-6
Downvoting a post can decrease pending rewards and make it less visible. Common reasons:
Submit